Indian Journal of Science and Technology

Abstract

Background/Objectives: CFRP has been utilized widely at various fields at the modern industry. This paper investigates the behavior of cracks propagated at mode 1 in the joined CFRP through simulation analysis. Methods/Statistical Analysis: The joined structure for mode 1 composed according to thickness is applied under the tensile load. The specimens with four kinds of thicknesses are modeled by three dimensions. The joined specimen model of mode 1 is composed with upper and lower sides. As the contact condition is maintained on the area touched with each other until the maximum tensile bonding strength, this stress can be evaluated. Findings: As the displacement of adhesive interface is increased, the reaction force applied to specimen is increased linearly. At the point on which the adhesive interface is fallen off, the nonlinear behavior is shown. It is thought that this reason is due to the abrupt reduction of bonded area. At the specimen thickness of 40 mm, the highest value of reaction force is shown as 1000 N and the lowest value is shown at the specimen thickness of 25 mm. But, to the contrary, the phenomenon of falling off is happened most rapidly at the specimen thickness of 40 mm. Whereas 14 MPa was produced at the initial 25 mm in the stress at the adhesion interface, a reduction to 6.3 MPa at 40 mm was be observed. A lower occurrence of fractures of adhesive interfaces could be seen due to the reduction in stresses when the thickness was increased. Through this study result, the fracture behavior until falling off at the bonded interface of structure can be examined. Application/Improvements: The safety of joined structure can be evaluated and the safe design data at the structure can be obtained by applying this result.
Keywords: Adhesive Interface, Carbon Fiber Reinforced Plastic, Double Cantilever Beam, Fracture Behavior, Mode1